Mars

Mars is a small, dusty world, the fourth planet in the Sol system, and the homeworld of the Martians.

Features
From space, Mars would look red with some spots of yellow, green and purple. Mars is a small planet, being nearly half the size of Earth. It is a red, dusty planet with large polar ice caps and frequent dust storms. Much like they thought Venus was a dead planet, Humans believed Mars was nothing but barren desert. They weren't completely wrong, though. Mars is a dying planet with no more oceans or large bodies of water,  and very little plant life, but Mars does have some jungles and lakes, and even underground seas and islands. There are many canyons and dried-up deltas, and in some canyons there are shallow rivers and even some forests, such as at the bottom of Mars's longest and deepest canyon, Vales Marinarus, the longest  canyon in the Sol system. There are also many volcanoes on the surface of Mars, the tallest one being Olympus Mons, which is the highest volcano in the Sol system as well.

Like Earth, Mars has a colorful array of lifeforms, including the Martians. Large, fearsome predators roam the northern polar ice cap, and insects the size of motorcycles called Sarths hunt in dark, dense, valley-bottom jungles. A large number of strange looking, beautiful flowers also thrive in these jungles. Eight legged, horse like beasts called Thoats and small, dog/reptile like creatures called Calots make their home on dried seabeds. In the subterranian seas giant eel like creatures called Kinzthes swim and hunt fish. Go deeper in these caves and biolumiscent algae covers everything  and glowing, floating jellyfish fly around. Back on the surface, you might run into giant white-furred White Apes and lion-like beasts called Banths. And growing nearly everywhere is Orche Moss. Mars has quite a few sentient species, like the Martians (Mars's dominent species), the Tharks, and the Okar.

Probes and rovers sent from Earth to Mars have not found any trace of life, and this is because Mars was dying, so the Firstborn, a race as old as the universe, used their advanced technology to keep Mars habitable. The energy field they use is not time transisional, though, so unless you actually go to the Martian surface, you would see a Mars that is dead.

History
Mars was once a very Earth-like planet, with large grassy stretches of land, active volcanoes, and five oceans. Yet millions of years ago, Mars's magnetic field started to weaken, and the oceans dried out. Life on Mars nearly had a mass extinction, it all nearly burning in the intensified rays of the sun. This might not have been 'nearly' if the Firstborn hadn't came along and set up a non-time transisional energy field to keep Mars alive.

The first Human to discover the truth about Mars was a man named John Carter.